Stiees



(H o Model.) 3 Sheets Sheet 1.

E; P. STILES.

DENTAL GHAIR.

v No. 361,906. Patented Apr. 26, 1887.. 45? @522- 3 Sheets-Sheet 2.

(No Model.)

I}. P. sums.-

DENTAL CHAIR.

tin, in the county'of Travis and State of Teiias,

"therein to the accompanying drawingsfi My invention relates to an iir'nprovementv in construction and combination of devices that will be more-fully set forth hereinafter, and

particularly pointed out in the claims.

Y ard; Fig. 9 is adetailed top plan of the clamp:

,. detail viewof the ratchet. used detailed views of the spittoou.

A represents the-foot of the chair, which is formed. of two .Woode'n bars, a and b, ,which cross each other beneath the .vertical axis of the t'ube'B, In the end of--.the longerarm-pf by the weight of a-person standing onthe foot:

lowerextreniities, and aroundits'upper'end is which 'fitover the arms a binea'r the point. of L intersection, as shownin Figs. 1,' -2,' and 4.

provements in Dental Ghairs, of which the fola-sidc elevation, partly in section, of; my i1n-' proved chair complete. Fig. 2;.is atop plan can section of the clamping-brace. Figs. 5,6,

adjusting mechanism; Fig. 11 isan inverted issocketed'inthe cylindrical portionofia'brace, .XV, wh ich is provided with four outwardly {DENTAL Nrrsn Tarts"? I f "1 riniroivn rffs i itns; or AUSTIN A plications led se rmter io. 1ss4. Serial'No.142,6(i9. '(Koniodel.

. Be it knownthat I, EDMUND I. Srrnns, a citizenof the United States, residing at Anshave invented certain new and useful-Imlowing is a specification,- reference being had dental chairs, and it -consists in thepeculiar This invention is an improvement uponthat for which Letters Patent of the United States No. 294,286 were granted to me February 26, 1884. v T v In the accompanying drawings-Figural is view of the base-. v Fig; 3 is avertical section of thercylindrical, standard. Fig54-Zis a ver- 7, a'ndS are detailed views illustrating details of the construction .Of l h6 supporting standing-strap and winch. Fig.110 is a side .elcvation, partly in section, of the head-rest andits plan view of thehead-rest. Figs. 12 and- 13 are-details illustrating the construction of-the adj listing mechanism. Fig. 14 shows the parts forming theIfoot-rest.detachedirFigQ 14 is a for adjusting the foot-rest. FigsQlii, 16, 17, 1-8, and 19 are the bar a i's a screw, z,;which is adapted to'be screwed intoth'e door so as to fix the chair thereto, and to prevent its. being overturned rest; Thetube B is reduced at its upper.- and placed a strengthening-band ,.a Its lower end projecting :sets" of bearingdugs or cars, d,

0n the upper end ,of the; tube B is placed a ,circular'plate, g, which is'of greater (jl iam'eter than said tube, and which-is provided with open-ended peripheral rectangularslotsb, .In the center ,of this plateis made a c rcular opening,which is equal in diameter to the interiOr diameter of the tube B; Aplate, slightly, larger than, the plate 9, and having open-ended peripheral slots, isplaeed beneath the arms a and I) at theirpoint of intersection, and. is clamped to theiplate g by means of'rods e e.- These rods are provided with square heads at their upperg ends, whichheads are beveled ;on their-under sides, and-are seated in the slotsfb which prevent themfrom turning and. from. slipping from the. .slots.

= The-lower ends of these rods are screw-threaded and provided with nuts', whiehjhave one convex face, for the purpose of fitting 'into concavities .iormed about the peripheral slots in plate f, as shown in Figs. 1 and 8. By .loos- ,enin thesenutsjt will befapparent that the rodsemay be readily removed from the clamp-' porting-pedestal, h'ereinbe'fore describedcan "be detached for convenience in transportation. 'D' represents a circular post, which extends through the opening formed in the plate 9 and into the hollow standard B. Inithe lower end [of this post is" swiveled a rollerblock, E, in

which is journaled as'inall grooved pulley, h.

{Zrepresents a, strap which p'asse's around the standard B, and which has its extremities formed intobearingsfor aj-winch, is, as shown at;Fig.-,9. ,One of these hearings is provided with a; downwardly-projecting extension, to

ing-plates, and thevarions sections of the supwhich is pivoted a weight-ed pawl, r, which I engages with a ratehet-wheel thatisformed 'withthe'winchk. I Y. it represents a bolt, which passesthrough the extremitiesof the strap -Z, for the'purpose of clamping it npointhe standard 'B.- This, strap is 'reducedin' thickness at its center opposite to the wi-nch,as shown at Fig; 9, thereby causing-its-ends to spring apart when the, n ut upon; the bolt 1 t is loosened,- and causes the strap to release its hold-upon the-standard.

'A- cord, t, having a'knot in its outer end, is passed through an opening'that is forn edin one side of the standard B, near its'upper end, downalong a groove-ithat is formed onjthe ICO inner side of the standard to-receive it,;nnder J plate 9, is capable of rotation in the standard.

The upper end of the post 1) enters a metallic socket, F.v Upon the horizontally-projecting wings p of this socket F, and between the upwardly-projecting lugs q thereof, isplaced a horizontal bar, G, which is preferably made of wood, the extremitiesof which are provided with trunnions 0', which enter proper hearings or sockets formed in the cleats s, which are attached longitudinally to the under side of the chair-body E. On the trannions r the chair-body can be swung into any su table inclined position longitudinally. These trunnions project beyond their hearings to form means of attachment for the foot-rest,

' whose arms q have bearings at their upper said socket.

ends for the purpose of such attachment, as shown at Fig. 1. \Vith the socket-piece F is also connected a brace-rod, t, which is pivoted to an ear, n, that extends reaFwardly from The rodt passes through a clamp, 12, that is attached to the rear portion of the chair-seat. By the thumb-screw of this clamp '22 the inclined position to which the chair may have been adjusted by turning it outhe trunnions 1- ean be maintained.

I represents the back of the chair, which is constructed in the manner fully set forth in my former patent hereinbefore referred to,.and which needsno recapitulatjon here. The rod z,whieh is adapted to be adjusted vertically in the chair back, has'its upper end bent at an angle thereto, and extends rearwardly in a horizontal line. This rearward extension has a slot fornied in it, as shown at Figs. 10 and 3 13. Through this slot is passed a bolt, f,

which is formed of two or more pieces, which,

when put together, form at the upper end a socket,as shown at Figs. 10 and 12. The lower end of this rod is screw-threaded. A cylin- 'drical nut, e, secures the bolt in the slot in any desired position, as shown at Fig. 10. A wire loop is passed around the lower end of the bolt in a groove that is formed to receive it, to prevent the pieces of which the bolt is composed from falling apart when the nut is removed. The outer surface of the bolt f 2 above the line 1 1 of Fig. 12 is spherical, while between thelines 1 1 and 2 2 it is cone-shaped.

The sides of the bolt at the line 2 2 are flattened to prevent the turning oft-he bolt in the slot v, as shown at Fig. 13. The upper socket- Q .endof the bolt f rests in a'cup-shapedcollar,

b, as shown at Fig. 10. This collar moves freely over the upper surface of the bar 2. Its

outer wallsare perpendicular, but its inner walls are inclined inwardly, forming an inverted cone-shaped socket. The inclination of its sides from a perpendicular is less than that of the sides of the inverted cone of the bolt f so that only the upper part of the bolthead comes in contact with the collar. \Vhen the parts are in position and the bolt e is turned up against the bar 2, the bolt is drawn forcibly into the collar, and the ball d,whi ch fits in the socket, is held firmly in position by the compression. socket and bolt a different inclination, the force is applied near the extremity of the bolt and the center of the hall, where it is'most needed, and by this construction wear is compensated. The ball (1 is connected with arod, hflnear one end thereof, which rod h is bent in the shape shown in Fig. 10, and has its ex:

tremities secured to a circular frame, yflwhich, when properly upholstered, forms a head-rest.

By this construction the head-rest is adapted to be moved back and forth and adjusted to any position that may be required, as will be very readily understood. v.

Secured to the braces N, which are pivoted to the chair seat and back,are formed waysp", for the receptiou of the inner ends of the removable arms 0. The foot-rest is composed of three sections, q r s. Section 1 consists of two bars, which are secured at their upper ends to the trunnions of the bar G, as previously described. The upper ends of these sections have metallic clips e On their outer sides are countersunk plates 1), and to their lower ends are attached plates '15, having oblique open-ended slots 9'. The side bars of section 0 are countersunk at the ends of the exterior surface to receive the shanks of the ratchets w, as shown at 'Fig. 14.. 'Each end of each of these bars 7- is furnished with plates similar to the plates is of the bars (f. The

falling pawl i is attached to the outer sides of the lower end of the side bars, q, forengaging with the ratchet w and maintaining said sections in their proper relative position. A bar, 8, passes through the slots jiand pivots the sections together. The section s is composed of side bars, which are constructed.

similarlyto the bars q. The foot-board Z? is pivoted in the upper ends of the bars 8 by By having the sides of the means of a rod, which extends through said.

foot-board'andiuto the open-ended slots, which are formed in the upper plates, k Washers m having deflected points a which enter perforations 0, that are formed in the plates k, retain the connecting-rods in the slots j This construction is shown at Fig. 14.: In order to separate the sections of the foot-rest it is only. necessary to withdraw the ratchet 10",;an'd the rods s will slip out. 7

The spittoon which I. prefer-to use in connection with the dental chair. is composed of a rubber pouch, R, which has an opening or neck formed at, its upper end, in which is secured a metallic ring, a, for the purpose of causing it to hang in the form of a funnel.

The pouch is supported by means of a hoop,

b, and the clamping-bracket S. The 1100p b is provided with a groove, as shown at Figs. 15, 17, and 18, and is composed of jointed sections, which are connected together by means of pins (2* and openings e, as shown at Figs. 18 and 19. In applying this hoop to the pouch its sections are folded toward each other, and so passed into the pouch and then opened. This leaves the upper portion of the pouch having the opening therein pendent in the hoop and forms the funnel to the spittoon, as shown at Fig. 15. The spring-rod S passes around the outer side of the pouch and presses it into the groove in the hoop, and thereby retains said hoop in position at Figs. 15 and 17. A hoop, 0, passes over the extremities of the spring-rod S and binds them together, as shown at Fig. 16. To the lower end of the pouch is affixed a loop, by which means the pouch may be suspended in an inverted position when the spittoon is not in use and thoroughly drained. The bracket S may be attached to the chair by passing it through loops that are secured to the under side of the chairseat, or in any other suitable manner.

Slotting the plates f and g for the reception of the rods 0 is merely doing what has been done heretofore in coupling parts together; but beveling and coneaving the edges of said slots and shaping the heads and nuts of the rods to correspond thereto is making a new and useful addition to such devices.

The variation of movement obtained for the head-rest has been obtained heretofore by securing to the cnshion-frame a portion of a spherical shell provided with a circular central opening, through which is passed a bolt having a head formed of a segment of a. sphere, said head resting within the shell, while the bolt projects down through its central opening and through a slotted bar adj ustably connected to the back of the chair, a handle-nut being screwed upon the lower end of said bolt; but in this device the head of the bolt does not permit of a free movement of the cushion, especially in tilting it backward and forward, since the least friction between the head and shell causes the bolt to slide in the slot of the bar. This disadvantage I .overcome in the ball-and-socket joint. I also cover the threaded end of the bolt by the cylindrical nut, which adds a finish to the head-rest not possessed by others.

Having thus described my invention, I

fit in the beveled slots of plate 9, and nuts,

each with a convex face to fit in the concavities about the slots in plate f, substantially as set forth. I

2. The combination of the chair-body, a pedestal for supporting it, a transverse bar, G, having trunnions at its extremities for pivoting the chair-body to the pedestal, and a footrest the bars q" of which are pivoted at their upper ends to the projecting ends of the trunnions of the bar G, substantially as described.

3. .In a foot-rest for dental chairs, the combination of the sections fr 8, having plates k provided'with slots j, rods sf, for securing the sections, together, ratchets w", pawls 2'", washers m and foot-board Z, substantially as shown and described. 7 v

4. The combination, with a dental chair, of a head-rest consisting of the slotted arm 2, collar I), bolt f", having a socket in its upper end and formed in halves,and tapered at its lower end and adapted to be clamped at its upper end by said'collar, ball d, adapted to fit in .the socket in the upper end of said bolt, cylin drical nut e", and frame y, with its cross-bar h", secured to said ball, as and for the purpose set forth. Y

5. The combination of the pouch R, ring a, secured in an opening formed in the upper end of said pouch, a ring, b, and clamping-bracket S, substantially as described.

In testimony whereof I atlix my signature in presence of two witnesses.

EDMUND P. STILES. \Vitnesses:

TAZEWELL M. McCoRKLE, M. B. SWEENEY. 

